130978861 has 4 divisors (see below), whose sum is σ = 141054172. Its totient is φ = 120903552.

The previous prime is 130978849. The next prime is 130978873. The reversal of 130978861 is 168879031.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 168879031 = 1609 ⋅104959.

It is an interprime number because it is at equal distance from previous prime (130978849) and next prime (130978873).

It can be written as a sum of positive squares in 2 ways, for example, as 11492100 + 119486761 = 3390^2 + 10931^2 .

It is a cyclic number.

It is not a de Polignac number, because 130978861 - 2⁷ = 130978733 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (130978831) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5037636 + ... + 5037661.

It is an arithmetic number, because the mean of its divisors is an integer number (35263543).

Almost surely, 2^130978861 is an apocalyptic number.

It is an amenable number.

130978861 is a deficient number, since it is larger than the sum of its proper divisors (10075311).

130978861 is a wasteful number, since it uses less digits than its factorization.

130978861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10075310.

The product of its (nonzero) digits is 72576, while the sum is 43.

The square root of 130978861 is about 11444.5996435000. The cubic root of 130978861 is about 507.8479883383.

The spelling of 130978861 in words is "one hundred thirty million, nine hundred seventy-eight thousand, eight hundred sixty-one".